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Pompeys Pillar National Monument


  • Southeast Montana
  • National Monument
Managed by the Bureau of Land Management and part of the National Conservation Lands, Pompeys Pillar National Monument is the only remaining on-site physical evidence of the Lewis and Clark Expedition.

Pompeys Pillar is a rock outcropping that rises 200 feet above the Yellowstone River 30 miles east of Billings. Pompeys Pillar is like a sandstone history book that reads like a who's who of western frontier history. Look on the rockface for the remains of animal drawings created by people who used the area for rendezvous, campsites, and hunting. In 1806 Captain William Clark carved his signature and the date in this rock. It is the only site on the trail where visible evidence of the Lewis and Clark Expedition may be viewed by the public. Interpretive tours.

Admittance Rate: $7.00/vehicle May - September.
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Alternate Phone
Mailing Address
Bureau of Land Management
5001 Southgate Drive
Billings, MT 59101
May 3 - September 27 Visitor Center is 0pen
October - April Visitor Center Closed, Monument open dawn to dusk to walk-in traffic May - September: Visitor Center Open 9:00am - 6:00pm daily Monument Gate open: 8:00am - 6:00pm
U.S. Government
Special direction map

Special Directions

Take Exit 23 off Interstate 94, approximately 30 miles east of Billings. Follow signs 0.5 mile to site.